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Carrie Lapaire, Graduate Student
and Peggy Sellers, Purdue University
|Daylily Rust on 'Lord of the Storm' Daylily (Penny Shows Relative Size)||Rust Spores Erupting from Rust Pustules (40 X Magnification)||Daylily Rust Spores (400X Magnification)|
Dr. Markus Scholler, Director of the Arthur Herbarium at Purdue University has confirmed the first case of daylily rust in Indiana. The disease caused by the fungus, Puccinia hemerocallidis Thuem., was identified on a "Lord of the Storm" daylily received from Floyd county.
Daylily rust is a new disease to the United States. It was first found in Florida in 2000. Since then, it has spread to several other states including Alabama, California, Connecticut, Georgia, Kansas, Kentucky, Louisiana, Minnesota, Mississippi, Missouri, North Carolina, Ohio, South Carolina, Tennessee, and Texas.
Symptoms of the disease appear as small (1/8 inch wide) bright yellow-orange blisters called pustules on the leaves of infected plants. These pustules contain orange colored spores that can be rubbed or blown from the leaf surface. As the disease progresses, leaves turn yellow and become dry.
This disease is considered a potentially serious threat to daylilies. It is easily spread among nurseries because the spores can be carried on foliage and tubers not showing symptoms of the disease. In addition, spores can reinfect the same daylily or others nearby.
This disease infects only daylilies and will not infect other lilies or garden plants. Resistant cultivars have not been identified and currently no fungicides are labeled specifically for control of daylily rust. Fungicides are being tested by researchers.
Homeowners, county educators, garden center personnel, and nurserymen are encouraged to look for this potentially serious disease of daylily. If daylily rust is suspected, immediately remove and burn infected leaf tissue except save a couple of leaves and submit to the Plant and Pest Diagnostic Lab directly or via your local county extension office for confirmation. Dr. David Petritz, Director of Extension at Purdue University, is requesting your cooperation in documenting the distribution of this disease in Indiana. Therefore, there will be no charge for daylily samples from Indiana submitted to the P&PDL by Indiana residents.
When submitting these samples to the P&PDL, please specify variety or cultivar if known, and when and from where the daylily was purchased. For a sample submission form, please contact your local county extension office, the Plant and Pest Diagnostic Lab web site, or call the P&PDL at 765-494-7071.
For additional information please refer to the following websites:
Daylily Rust Information Page
Indiana Department of Natural Resources Division of Entomology & Plant Pathology
The information given herein is supplied with the understanding that no discrimination is intended and no endorsement by the Purdue University Cooperative Extension Service is implied. Any person using products listed assumes full responsibility for their use in accordance with current direction of the manufacturer. Purdue University is an equal opportunity/equal access institution.
Information listed is valid only for the state of Indiana.
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Last updated: 11 December 2002/jrm
The Plant & Pest Diagnostic Laboratory at Purdue University.